Back to the cleaning a chassis with water. Back in the mid 1960s, our organization bought a new Tektronix 'scope (one of those models with 42 vacuum tubes). Part of the purchase price included a class by Tektronix. The instructor started the class talking about cleaning the innards periodically with water. I don't think we ever cleaned it that way. Of course, I don't think the 'scope had a flyback made out of unobtainium.
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